<?php

/**
 * 翻页
 * @author user
 *
 */
class Paginator
{
    // 分页栏每页显示的页数
    public $rollPage = 5;
    // 页数跳转时要带的参数
    public $parameter;
    // 默认列表每页显示行数
    public $listRows = 20;
    // 起始行数
    public $firstRow;
    // 分页总页面数
    protected $totalPages;
    // 总行数
    protected $totalRows;
    // 当前页数
    protected $nowPage;
    // 分页的栏的总页数
    protected $coolPages;
    // 分页显示定制
    protected $config = array(
        'ha' => '共',
        'header' => '条',
        'prev' => '上一页',
        'next' => '下一页',
        'first' => '第一页',
        'last' => '最后一页',
        'theme' => ' %upPage%  %first%  %prePage%  %linkPage%  %downPage% %nextPage% %end%'
    );
    // 'theme'=> ' %upPage% %first% %prePage% %linkPage% %downPage% %nextPage% %ha% %totalRow% %header% %end%'

    // 默认分页变量名
    protected $varPage = 'page';

    /**
     * 架构函数
     * @access public
     * @param array $totalRows 总的记录数
     * @param array $listRows 每页显示记录数
     * @param array $parameter 分页跳转的参数
     */
    public function __construct($totalRows, $listRows = '', $parameter = '')
    {
        $this->totalRows = $totalRows;
        $this->parameter = $parameter;
        if (!empty($listRows)) {
            $this->listRows = intval($listRows);
        }
        $this->totalPages = ceil($this->totalRows / $this->listRows); // 总页数
        $this->coolPages = ceil($this->totalPages / $this->rollPage);
        $tmp = isset($_GET[$this->varPage]) ? intval($_GET[$this->varPage]) : 1;
        if (!$tmp) $tmp = 1;
        $this->nowPage = !empty($_GET[$this->varPage]) && $tmp ? $tmp : 1;
        if (!empty($this->totalPages) && $this->nowPage > $this->totalPages) {
            $this->nowPage = $this->totalPages;
        }
        $this->firstRow = $this->listRows * ($this->nowPage - 1);
    }

    public function setConfig($name, $value)
    {
        if (isset($this->config[$name])) {
            $this->config[$name] = $value;
        }
    }

    /**
     * 分页显示输出
     * @access public
     */
    public function show()
    {
        // if(0 == $this->totalRows) return '';
        $p = $this->varPage;
        $nowCoolPage = ceil($this->nowPage / $this->rollPage);
        $url = $_SERVER['REQUEST_URI'] . (strpos($_SERVER['REQUEST_URI'], '?') ? '' : "?") . $this->parameter;
        $parse = parse_url($url);
        if (isset($parse['query'])) {
            parse_str($parse['query'], $params);
            unset($params[$p]);
            $url = $parse['path'] . '?' . http_build_query($params);
        }
        // 上下翻页字符串
        $upRow = $this->nowPage - 1;
        $downRow = $this->nowPage + 1;
        if ($upRow > 0) {
            $upPage = "<li><a href='{$url}&{$p}={$upRow}' class='page_btn'>{$this->config['prev']}</a></li>";
        } else {
            $upPage = "";
        }
        if ($downRow <= $this->totalPages) {
            $downPage = "<li><a href='{$url}&{$p}={$downRow}'  class='page_btn'>{$this->config['next']}</a></li>";
        } else {
            $downPage = "";
        }
        // 1 2 3 4 5
        $linkPage = "";
        for ($i = 1; $i <= $this->rollPage; $i++) {
            $page = ($nowCoolPage - 1) * $this->rollPage + $i;
            if ($page != $this->nowPage) {
                if ($page <= $this->totalPages) {
                    $linkPage .= "<li><a href='{$url}&{$p}={$page}'  class='page_btn'>&nbsp;{$page}&nbsp;</a></li>";
                } else {
                    break;
                }
            } else {
                if ($this->totalPages != 1) {
                    $linkPage .= "<li class='active'><a>" . $page . "</a></li>";
                }
            }
        }
        $pageStr = str_replace(array(
            '%ha%',
            '%header%',
            '%nowPage%',
            '%totalRow%',
            '%totalPage%',
            '%upPage%',
            '%downPage%',
            '%first%',
            '%prePage%',
            '%linkPage%',
            '%nextPage%',
            '%end%'
        ), array(
            $this->config['ha'],
            $this->config['header'],
            $this->nowPage,
            $this->totalRows,
            $this->totalPages,
            $upPage,
            $downPage,
            $linkPage
        ), $this->config['theme']);
        return array(
            'html' => $pageStr,
            'totalRow' => $this->totalRows
        );
    }
}